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Stone, N. H.

Publications and source records attributed to Stone, N. H..

62 records · Page 4
All sourcesNASA NTRSDOE OSTI
NASA NTRS1974

Laboratory simulation of the structure of disturbed zones around bodies in space

Description of laboratory studies of certain aspects of the spacecraft/space plasma interaction regarding, in particular, the near and intermediate wake regions. The plasma wind tunnel facilities and the diagnostic techniques employed in these tests are described. Results are obtained which concern the variation of the normalized ion flux with normalized distance along the wake axis downstream from a conducting spherical body, the variation of the normalized width of the disturbed region with normalized distance downstream from the body center, and the location of the point of maximum ion current enhancement as a function of body potential.

Stone, N. H.↗
NASA NTRS1974

Laboratory simulation of space aerodynamic phenomena - Satellite wake studies

The reasons for and the results of laboratory simulation studies of space plasma flow over obstacles are discussed in the context of satellite-ionosphere interactions and of forthcoming Skylab experiments. So far, it appears that ions passing through the plasma sheath are focused onto the wake axis, thereby creating an enhanced ion current which peaks at approximately a 'Mach' number of radii downstream from floating spherical bodies. The location of the peak enhancement shows a hyperbolic dependence on body potential, while its structure depends on the body cross-sectional geometry rather than on the axial dimension. There is a corresponding enhancement of the electron current coexistent with the ion-current enhancement. An electron temperature enhancement can sometimes occur in the near-wake 'ion void' region with a magnitude inversely proportional to charged particle density. Some supplementary experiments are suggested to support the planned Skylab experiments.

Samir, U.↗
NASA NTRS1973

Multiring probe in a flowing ionospheric plasma.

Description of a multiring probe placed in an ionospheric flow simulation chamber utilizing a modified Kaufman ion engine for its plasma source. The pertinent details of the probe design, instrumentation, and operating procedures are discussed, and the preliminary results obtained are presented.

Sheldon, J. W.↗
NASA NTRS1972

Collisionless plasma flow over a conducting sphere.

Laboratory simulation study of spacecraft-space plasma interaction using a plasma wind tunnel. Some preliminary results on a collisionless plasma flow pattern over a conducting sphere are presented. A physical explanation is given for the observed plasma flow behavior.

Stone, N. H.↗